He's been 'unlucky in love'. [=he has had a series of bad romantic relationships]
She was 'unlucky' enough to get a flat tire on the way to her job interview.
He thinks it's 'unlucky' to have a black cat cross your path.
(..) She'd bed down with the meanest snake she could find, and then when things got bad, she'd go runnin' back to Mud. He'd take her back. Then he'd go find whatever unlucky son of a bitch laid a hand on her and beat him so bad he'd know never to touch her again. Only this time, I guess (..)2012 Mud